EP0763807B1 - System zur Schätzung und Übermittlung von Verkehrsinformationen - Google Patents

System zur Schätzung und Übermittlung von Verkehrsinformationen Download PDF

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Publication number
EP0763807B1
EP0763807B1 EP96113768A EP96113768A EP0763807B1 EP 0763807 B1 EP0763807 B1 EP 0763807B1 EP 96113768 A EP96113768 A EP 96113768A EP 96113768 A EP96113768 A EP 96113768A EP 0763807 B1 EP0763807 B1 EP 0763807B1
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EP
European Patent Office
Prior art keywords
radio coverage
cell
mobile end
user devices
coverage area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP96113768A
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English (en)
French (fr)
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EP0763807A1 (de
EP0763807B2 (de
Inventor
Mark Jeffrey Foladare
Shelley B. Goldman
Kin K. Leung
Yzahk Ronan
Gabriel Gary Schlanger
David Phillip Silverman
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AT&T Wireless Services Inc
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AT&T Corp
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/096741—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where the source of the transmitted information selects which information to transmit to each vehicle
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/096758—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where no selection takes place on the transmitted or the received information
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station

Definitions

  • This invention relates to communications systems and more particularly to a method and a system for estimating and delivering road condition information to communications services users.
  • LEO Low Earth Orbit
  • VSAT Very Small Aperture Terminals
  • GPS global positioning service
  • Prominent among the services provided under the umbrella of global positioning are real-time locator and navigation services for automobile drivers and pedestrians, not to mention security- and military-related applications.
  • the real-time locator service identifies the relative position of a device within a few feet of the real coordinates of the device.
  • the navigation service provides directions to an end-user (in the form of digital maps, for example) based on a user's position as well as traffic congestion with respect to that position.
  • market acceptance of global positioning service has been slower than anticipated by the GPS planners and designers. This is primarily because global positioning service providers have to spread the high cost of procuring and launching (LEO) satellites over a small customer base.
  • IVHS Intelligent Vehicle Highway System
  • the infrastructure for the Intelligent Vehicle Highway System is probably less costly than the infrastructure of the Global Positioning System, which would lead to an expectation of lower cost for IVHS-based service.
  • IVHS developers have found out that because IVHS service is limited to congestion detection/management and traffic reporting, the IVHS customer base may even be smaller than the one for GPS. Hence, the smaller IVHS customer base may operate to vitiate any competitive advantage IVHS may enjoy over GPS.
  • radio stations broadcast periodic traffic condition reports targeted at drivers on major metropolitan highways.
  • the radio stations typically receive the traffic report information that they broadcast from sources such as reporters on board strategically located helicopters.
  • the radio-broadcast traffic information reporting service is delivered primarily during rush hours, and is targeted primarily to listeners on major highways.
  • the delivery time and scope of the radio-broadcast information operate to make that information worthless to drivers who are traveling either during non-rush hours, or on a congested secondary highway or a suburban road.
  • the radio-broadcast traffic information reporting service does not offer detailed alternate paths to allow targeted drivers/listeners to avoid the congested area.
  • the radio-broadcast traffic information "ages" rapidly (typically, far more rapidly than the radio-broadcast report frequency) as new accidents occur and old ones no longer hamper road traffic.
  • Another known system is set forth in United States Patent No. 5,182,555 (“Sumner”) which discloses a technique to provide real-time traffic congestion data to drivers of suitably equipped vehicles.
  • the Sumner system includes apparatus for gathering and formatting data at a central location, transmitting the data to vehicles, processing data in the vehicles and presenting it to the drivers.
  • the Sumner system design provides inputs for a wide range of data sources at a central location where, through a data fusion process, information from a range of sources may be accumulated and aggregated into a single congestion level data value for each section of road.
  • a range of options may be available for presenting relevant congestion data to the driver including text, voice and map displays.
  • One data source used for input at the central location in the Sumner system may be electronic tracking devices installed in a number of individual motor vehicles.
  • the electronic tracking devices are special devices installed in individual motor vehicles that transmit tracking data in the form of latitude, longitude, distance, heading, and velocity to the communication system over a radio link, or alternatively, a telephone communications interface.
  • the Sumner system requires the deployment of a costly information collection infrastructure, which includes electronic tracking devices.
  • a problem of the prior art is lack of an "anytime, anywhere" solution that allows delivery of road congestion information to users without deploying a new costly information collection infrastructure.
  • the present invention is directed to a system which estimates traffic conditions in the thoroughfares located in one or more radio coverage areas of a wireless communications network based on an analysis of real-time and past traffic information carried on, and collected by, the wireless communications network.
  • the data collection process is performed as part of the registration operation and hand-off procedure carried out by the wireless communications network.
  • Data analyzed may include, for example, actual (current) and expected (past average) number of a) active-busy wireless end-user devices in one or more cells at a particular period of time, and b) active-idle wireless end-user devices registered in a location area of the wireless communications network.
  • an inference of traffic congestion may be made when the number of wireless end-user devices active in a cell or location area exceeds a given threshold.
  • the ratio of actual to expected registered number of wireless devices that are active-busy in a cell and/or active- idle in a location area may be indicative of a bottleneck in one or more major roads located in that cell or in that location area.
  • the same ratio in adjacent cells or location areas provides orientation information regarding bottlenecks on that road.
  • an inference is made that a bottleneck is present in the northbound section of the highway or the major road located in cell A.
  • the inference of road traffic congestion based on higher than expected traffic level in particular coverage areas of a wireless network is supported by empirical studies which tend to indicate a direct correlation between traffic jams on a road and increased wireless network traffic in a cell where the congested section of that road is located.
  • the expected traffic level for a cell is derived from past historical data collected by a wireless communications network.
  • the expected traffic level also takes into consideration time-dependent factors, such as time-of-day, day-of-week, day-of-year. Other variables factored in the determination of the threshold level include scheduled events, such as parades and road repairs.
  • an inference of traffic congestion on a road within the coverage area of a cell or location area may be made when a significant number of wireless devices spend higher than an expected amount of time to traverse that cell or location area.
  • the expected amount of time for a wireless device to traverse a cell is based on past historical data which factors therein time-dependent parameters, such as time-of-day, day-of-week and day-of-year.
  • a user may subscribe to the on-demand traffic reporting service which allows the user to be alerted of possible congestion on any road of an itinerary provided by the user.
  • the itinerary may list, for example, different cells in which the subscriber is expected to travel within particular time intervals.
  • a subscriber may receive unsolicited traffic reports of road congestion and alternate routing information whenever the current cell (location area) in which the subscriber is located and/or cells (location areas) adjacent to that current cell (location area) are experiencing higher than expected wireless traffic.
  • a communications switching system that includes a wireless network 20 and a land-line network 30.
  • the land-line network 30 is comprised of interconnected local, tandem and toll switches (not shown) that enable a telephone call to be completed to a wired telephone set (such as set 80) or to be forwarded to wireless network 20.
  • the latter includes modular software and hardware components designed to provide radio channels for communications between mobile end-user devices and other devices connected to the communications switching system of FIG. 1.
  • Wireless network 20 may be an analog communications system using, for example, the Advanced Mobile Phone Service (AMPS) analog cellular radio standard.
  • AMPS Advanced Mobile Phone Service
  • wireless network 20 may be a digital communications system implementing well-known code division multiple access (CDMA) or time-division multiple access (TDMA) techniques. Additional information on TDMA and CDMA access techniques can be found in AT&T Technical Journal , Vol. 72, No. 4, July/August 1993, pp. 19-26.
  • CDMA code division multiple access
  • TDMA time-division multiple access
  • the wireless network 20 is comprised of a number of base stations 1 to 12, each one of which includes a transceiver, an antenna complex (antenna and tower), and a controller that are arranged to wirelessly communicate with mobile end-user devices 90-93 when they are located in the radio coverage area of one of the base stations. That radio coverage area is referred to in the art as a "cell” for cellular networks and “microcells” for Personal Communications Network (PCN).
  • base stations 1-12 perform certain call setup functions that include initial channel assignment and supervision of the wireless link establishment.
  • wireless switch 50 that monitors and coordinates the operations of the base stations 1-12. It includes a processor 55 (whose functions are described below) and a Mobile Switching Center (MSC) 52 which provides seamless communications paths for calls (that span the wireless network 20 and the land-lines network 30) by "bridging" radio channels (from wireless network 20) with “wire” channels (from land-line communications network 30).
  • MSC Mobile Switching Center
  • the processor 55 includes a CPU 101 and a storage area 100.
  • CPU 101 coordinates some of the call processing functions performed by base stations 1-12.
  • Storage area 100 contains, in addition to the processing instructions illustrated in FIGs. 3-5 (contained in general storage area 106), registration and cell counters 104 and 105 and registration and cell timer complexes 102 and 103.
  • the counters and timers may be implemented, for example, as a series of EEPROMs which store the individual values of the counters for each cell and the individual values of the timers for each mobile end-user device in an active-busy state.
  • Other functions performed by CPU 101 include the registration procedure and hand-off operations that allow wireless network 20 to identify, validate and track the location of wireless end-user devices 90-93 within specific radio coverage areas as these devices move within the geographical area covered by the wireless network.
  • HLR/VLR Home Location Register and Visitor Location Register
  • a location area is assigned to a collection of cells, such as base stations 1-12.
  • an active-idle mobile i. e., a device that is energized but that is not emitting or receiving speech or data signals
  • wireless switch 50 needs to complete a call to one of the mobile devices 90-93, it broadcasts a paging signal only to the cells associated with the location area where the mobile device is registered.
  • CPU 101 of wireless switch 50 increments an appropriate counter in registration counter 104 by "one” and starts an appropriate timer in the registration timer complex 102.
  • the processor 55 of wireless switch 50 decrements the registration counter by "one” and sends a signal to the registration complex 102 to cause the timer associated with that device to reset.
  • the hand-off operations are performed by CPU 101 in cooperation with base stations 1-12.
  • Each one of the base stations 1-12 is arranged to measure and assess the strength of signals received from an active-busy mobile device. Hence, as a mobile end-user device crosses the boundary of one of the base stations 1-12 to enter another one of these base stations, the diminished strength of the signal received by the exiting cell impels CPU 101 of wireless switch 50 to initiate the hand-off procedure which assigns a radio channel from the new base station for communications with the mobile end-user device.
  • Processor 55 is arranged to increment by "one" a cell counter for a cell whenever one of the mobile end-user devices 90-93 initiates a call from a location within the coverage area of that cell.
  • CPU 101 also increments by "one" the appropriate counter in cell counter 105 when one of the mobile end-user devices 90-93 (in an active-busy state) enters the radio coverage area of that cell. In that case, CPU 101 also records the cell number of the previous cell to identify the direction being traveled by the user of the mobile end-user device.
  • the mobile end-user devices 90-93 may be cellular telephone sets, two-way pagers, multimedia wireless devices or even low-mobility portable communications devices when wireless network 20 is a Personal Communications Network (PCN).
  • PCN Personal Communications Network
  • processor 55 also includes a registration timer complex 102 and a cell timer complex 103 which are comprised of a series of EEPROMs with clocks that are associated with particular mobile end-user devices in specific situations. For example, CPU 101 starts a timer for one of mobile end-user devices 90-93 when that device registers. Similarly, when one of mobile end-user devices 90-93 initiates a call or enters a new cell, CPU 101 starts a timer for that device. Both types of timers are designed to reset upon receiving a particular type of signal from CPU 101.
  • That signal is emitted by CPU 101 to a) a registration timer when a user powers off an energized mobile end-user device, and b) to a cell timer when an active-busy mobile end-user device leaves a cell or is turned off.
  • the cell timer complex 103 is shown as part of the wireless switch 50, it is to be understood that it may be implemented as a stand-alone device or may be alternatively included in a processor of each of the base stations 1-12.
  • Cell timer 103 is arranged to forward a signal to CPU 101 when a timer has exceeded a particular threshold.
  • the value associated with that threshold is based on past average period of time for a driver, for example, to traverse that cell under similar conditions, such as same time-of-day, same day-of the-week and same day-of-the-year.
  • This past average period of time that is hereinafter referred to as "past average analog equivalent amount of time” is forwarded periodically by CPU 101 to cell timer complex 103.
  • VIS Voice Information System 53 that is arranged to a) initiate calls to mobile end-user devices 90-93 when a particular event occurs, b) receive calls and prompt callers for specific information by asking questions based on a set of modules in a transaction script, c) collect information from a caller in the form of speech input or Dual Tone Multi Frequency, and d) forward collected information to processor 55.
  • VIS Voice Information System
  • processor 55 In addition to the registration and cell counters, processor 55 also stores the table of FIG. 2 which correlates particular cells (shown in the leftmost column) to sections of a thoroughfare (depicted in the second leftmost column).
  • FIG. 2 shows only one major thoroughfare per cell, it is to be understood that more than one major thoroughfare may be served by one cell. In that latter case, the strength of the signal received by one of the base stations 1-12 may be used to distinguish which mobile end-user devices are traveling on which thoroughfare.
  • each one of those thoroughfares has its own reference points, alternate routing information and adjacent cells entry in the table of FIG. 2.
  • the table of FIG. 2 also includes reference points (shown as the middle column of FIG. 2) which identify the general boundaries of a section of a thoroughfare served by a particular cell.
  • the reference points may be well-known streets, or exit numbers of a highway. Illustrated in the rightmost column of FIG. 2 are adjacent cells whose function in the road bottleneck identification and estimation process is described in detail below. Suffice to say for now that those adjacent cells are oriented in the same direction as the cell serving a particular section of the thoroughfare.
  • highway 1 shown in the top row of FIG. 2
  • adjacent cells 2 and 1 are cells that are located to the north and south, respectively, of cell 3.
  • alternate routing information that represents other thoroughfares oriented in the same direction as the section of a thoroughfare served by a particular cell.
  • alternate route information may be implemented, for example, as pointers to stored digital maps associated with the geographical area served by a particular cell.
  • FIG. 3 is a flow diagram of illustrative instructions executed by some of the components of the communications switching system of FIG. 1 to collect information on wireless end-user devices located within the radio coverage area of the wireless network of FIG. 1.
  • the information collection process contemplated by the invention is initiated in step 301 when a user turns on one of the mobile end-user devices 90-93. This triggers the registration procedure, in step 302, which causes CPU 101 to increment by "one" the appropriate counter in registration counter 104 for the location area of the device. If the user initiates a call, as determined in step 303, CPU 101 proceeds, in step 306, to increment by "one" a counter in cell counter 105, and to start a timer in the cell timer complex 103 in step 307. If the user does not initiate a call, a determination is then made, in step 304, as to whether the energized device has been powered off. If so, the registration counter is decremented by "one" to end the information collection process.
  • step 303 After a call has been initiated (as determined in step 303), the appropriate counter in the cell counter incremented (as shown in step 306) and the timer started (as indicated in step 307), the call is monitored by CPU 101 to determine in step 308 whether the device has left the cell. If so, CPU 101, in step 312, sends a signal to cell timer complex 103 to stop the timer for the device, and to decrement by "one" the counter for the cell exited by the device. Thereafter, a determination is made in step 313 as to whether the device has entered a new cell. If so, steps 306 through 308 are repeated. Otherwise, steps 304 and 305 (as needed) are performed.
  • step 308 When it is determined, in step 308, that the device has not left the cell, CPU 101 performs a test in step 309 to ascertain whether the amount of time indicated by the timer exceeds a pre-determined threshold represented by the past average analog equivalent amount of time for devices in that cell. When the result of that test is negative, step 308 and other subsequent steps are performed as needed. If the result of the test is positive, CPU 101 performs a second test to determine whether the exception counter has already been incremented for the device in question. If so, step 308 and other subsequent steps are performed as needed. Otherwise, an exception counter is incremented by one in step 310, and step 308 is repeated.
  • step 401 One of the road traffic estimation and delivery processes of the invention is initiated in step 401, when CPU 101 compares the value indicated by the cell counter for a particular cell (called “cell count A") to the expected average number of active-busy devices (B) in that cell under equivalent analog conditions, such as time-of-day, day-of-week, day-of-year.
  • CPU 101 determines in step 402 whether the value of the cell counter. A exceeds the expected average B by more than 25%. It should be noted that this percentage value is provided for illustrative and pedagogical purposes only and therefore do not limit the scope of the invention.
  • CPU 101 retrieves the cell profile in step 403 and identifies the direction of a potential traffic jam in step 404. This is done by comparing the value of the cell counter in each of the adjacent cells (indicated by the cell profile) to the respective expected analog equivalent average of each adjacent cell.
  • the adjacent cells in question are located in the same general direction in which traffic flows in the thoroughfare.
  • step 406 a message that is indicative of presence of bottlenecks in the section of the thoroughfare (associated with the cell profile) is delivered to subscribers in that cell and other affected adjacent cell(s). If, however, it is determined in step 405 that the cell count is less than 50 %, then a warning message that is indicative of the presence of a potential bottleneck in the section of the thoroughfare (associated with the cell profile) is delivered in step 407 to subscribers in that cell and other affected adjacent cell(s).
  • the format in which those messages may be delivered is described below.
  • the registration counter may be used as well to estimate road traffic conditions. For example, when the location area covers a geographical area that can be associated with a section of a thoroughfare, the number of active-idle mobile devices registered in that location area may be used to estimate road traffic conditions on that section of the thoroughfare.
  • the technique described in conjunction with FIG. 4 could also be used.
  • a second road traffic estimation and delivery process of the invention is initiated in step 501 when CPU 101 compares the value of the exception counter C to the cell count A.
  • CPU 101 retrieves the cell profile table of FIG. 2. Thereafter, CPU 101, in step 504, identifies the direction of a potential traffic jam using the techniques described earlier. If the value of the exception counter is over half the value of the exception counter, as determined in step 505, then a message that is indicative of presence of bottlenecks in the section of the thoroughfare (indicated by the cell profile) is delivered to subscribers in that cell and other affected adjacent cell(s).
  • step 505 If however, it is determined in step 505 that the cell count is less than 50 %, then in step 507 a warning message that is indicative of the presence of a potential bottleneck in the section of the thoroughfare (associated with the cell profile) is delivered to subscribers in that cell and other affected adjacent cell(s).
  • the aforementioned messages may be delivered in audible format via a call initiated by Voice Information System 53 to a subscriber.
  • the message may also include alternate routing information (associated with the cell) to allow the subscriber to avoid the congested section of the thoroughfare.
  • the message may be delivered in graphical format in the form of a digital map indicating the location of the bottleneck and directions to other less congested roads.
  • call waiting features are available for the mobile end-user devices 90-93
  • an appropriate road condition message may be delivered to a subscriber even when the mobile end-user device of the subscriber is in an active-busy state.
  • a digital map can be delivered to a monitor connected to the mobile end-user device even when the device is in an active-busy state.
  • a message indicative of presence of bottleneck in a section of a thoroughfare could be delivered to subscribers in that cell when both conditions of a two-prong test are satisfied.
  • the first condition may require, for example, that a certain number of active-busy devices in a cell exceed the past average analog amount of time spent in that cell while the second condition may dictate that the number of active-busy devices in a cell exceed the expected average (analog equivalent) number of active-busy devices by a certain percentage value.
  • users may subscribe to the road traffic estimation and delivery service of the invention by pre-registering for the service.
  • Voice Information System 53 delivers one of the messages described above to the subscriber.
  • the user may provide an itinerary by speech input or DTMF signal to Voice Information Service 53 which delivers appropriate messages (received from CPU 101) to the subscriber whenever congestion occurs in sections of the road associated with that itinerary.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Traffic Control Systems (AREA)
  • Small-Scale Networks (AREA)

Claims (19)

  1. Verfahren zur Bestimmung von Straßenverkehrsbedingungen auf Verkehrsstraßen, die in Funkabdeckungsbereichen gelegen sind, die durch ein drahtloses Kommunikationsnetzwerk (20) bedient werden, welches eine Mehrzahl von Basisstationen (1 bis 12) enthält, von denen jede eine Zelle in den Funkabdeckungsbereichen versorgt, und welches weiter einen Funkschalter (50) enthält, der mit der Mehrzahl von Basisstationen (1 bis 12) gekoppelt ist, wobei das Verfahren folgende Schritte aufweist:
    Empfang von Echtzeit-Registrierungsdaten und Zellenaktivitätsdaten von aktiven mobilen Endverbraucherapparaten (90, 91), die sich augenblicklich in jeder der genannten Anzahl von Zellen befinden, die durch das Funk-Kommunikationsnetzwerk (20) versorgt werden, von jeder aus einer Mehrzahl von Zellen über den Funkschalter (50), der mit einer Basisstation (9, 19) gekoppelt ist, welche einer Zelle zugeordnet ist; und
    Abschätzen der Straßenverkehrsbedingungen auf mindestens einer der Verkehrsstraßen, die in dem genannten mindestens einen der Funkabdeckungsbereiche gelegen ist, auf der Basis eines Vergleiches (401, 501) der genannten Echtzeit-Registrierungsdaten und Zellenaktivitätsdaten mit vergangenen analogen entsprechenden Informationen, die zuvor durch das Funk-Kommunikationsnetzwerk (20) für den mindestens einen der Funkabdeckbereiche eingesammelt worden sind.
  2. Verfahren nach Anspruch 1, bei welchem die Information, die den genannten abgeschätzten Straßenverkehrsbedingungen zugeordnet ist, zu mindestens einem Benutzer eines der genannten mobilen Endverbraucherapparate (90) gesandt wird (406, 407, 506, 507).
  3. Verfahren nach Anspruch 2, bei welchem die genannte Information, welche den abgeschätzten Straßenverkehrsbedingungen zugeordnet ist, in akustischer Form zu dem mindestens einen Benutzer eines der mobilen Endverbraucherapparate (90) gesandt wird (406, 407, 506, 507).
  4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die genannte Information, die den genannten abgeschätzten Straßenverkehrsbedingungen zugeordnet ist, in graphischer Form an den genannten mindestens einen Benutzer eines der mobilen Endverbraucherapparate (90) gesandt wird (406, 407, 506, 507).
  5. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Information, die den genannten abgeschätzten Straßenverkehrsbedingungen zugeordnet ist, zu dem genannten mindestens einen Benutzer eines der mobilen Endverbraucherapparate gesandt (406, 407, 506, 507) wird, wenn sich der genannte der mobilen Endverbraucherapparate (90) in einem aktiven Zustand bzw. Besetztzustand befindet.
  6. Verfahren nach Anspruch 1, bei welchem der Schritt des Abschätzens weiter folgende Schritte umfaßt:
    Buchen (302, 305, 306, 307, 311, 312) mindestens eines Teiles der genannten Echtzeit-Registrierungsdaten und Zellenaktivitätsdaten zur Bestimmung einer Gesamtzahl von mobilen Endverbraucherapparaten, die in mindestens einem der Funkabdeckungsbereiche innerhalb einer bestimmten Zeitdauer aktiv sind; und
    Bestimmen (411), ob die genannte Gesamtzahl aktiver mobiler Endverbraucherapparate in dem mindestens einen der Funkabdeckungsbereiche einen ersten Schwellwert übersteigt, der durch die vorausgegangene analoge äquivalente Information für den mindestens einen der Funkabdeckungsbereiche angezeigt ist.
  7. Verfahren nach Anspruch 6, welches weiter folgenden Schritt aufweist:
    Feststellen (405), daß ein Engpaß in mindestens einem Abschnitt mindestens einer der Verkehrsstraßen vorhanden ist, die in den Funkabdeckungsbereichen gelegen sind, wenn die genannte Gesamtzahl aktiver mobiler Endverbraucherapparate in dem mindestens einen der Funkabdeckungsbereiche den ersten Schwellenwert um einen gegebenen Prozentsatz übersteigt.
  8. Verfahren nach Anspruch 1, bei welchem die genannten Zellenaktivitätsdaten eine Zeitdauer enthalten, die von mindestens einem aktiven mobilen Endverbraucherapparat in mindestens einer Zelle verbracht wird.
  9. Verfahren nach Anspruch 8, welches weiter folgende Schritte aufweist:
    Zählen (311) der Gesamtzahl der aktiven mobilen Endverbraucherapparate, welche jeweils individuell in der mindestens einen Zelle eine Zeitdauer verbringen, welche einen zweiten Schwellenwert übersteigt, der durch die genannte letzte analoge äquivalente Information für diese mindestens eine Zelle angezeigt wurde; und
    Feststellen (505), daß ein Engpaß in mindestens einem Abschnitt mindestens einer Verkehrsstraße vorhanden ist, die der mindestens einen Zelle zugeordnet ist, wenn die Gesamtzahl größer als ein gegebener Prozentsatz einer Zählung sämtlicher mobilen Endverbraucherapparate ist, die in der genannten mindestens einen Zelle aktiv sind.
  10. Verfahren nach Anspruch 7 oder 9, welches weiter folgenden Schritt aufweist:
    Identifizieren (404, 504) einer Richtung der genannten mindestens einen Verkehrsstraße, in welcher sich der Engpaß befindet, wobei die Identifizierung auf der Basis einer relativen Größe von gegenwärtiger Funkaktivität in mindestens zwei Zellen erfolgt, welche an den genannten mindestens einen der Funkabdeckungsbereiche angrenzen.
  11. System zur Bestimmung von Straßenverkehrsbedingungen in einem geographischen Bereich, der einer Mehrzahl von Funkabdeckungsbereichen entspricht, die durch ein Funk-Kommunikationssystem (20) bedient werden, das eine Mehrzahl von Basisstationen (1 bis 12) enthält, die eine Zelle in den Funkabdeckungsbereichen versorgen, und das einen Funkschalter (50) enthält, der mit den Basisstationen, die jeweils einer Zelle zugeordnet sind, gekoppelt ist, wobei das System folgendes aufweist:
    eine Funk-Verkehrsüberwachungseinrichtung, welche mit dem Funkschalter (50) gekoppelt ist und welche einen gegenwärtigen Strom von aktiven mobilen Endverbraucherapparaten (90, 91) verfolgt, die mindestens einen aus einer Mehrzahl von Funkabdeckungsbereichen betreten oder verlassen, welche durch das Funk-Kommunikationssystem (20) bedient werden, wobei eine Mehrzahl von Straßen in der Mehrzahl von Funkabdeckungsbereichen gelegen ist;
    einen Prozessor (55), welcher den gegenwärtigen Strom für den genannten mindestens einen Funkabdeckungsbereich mit einem vergangenen mittleren Strom vergleicht, der von dem Funk-Kommunikationssystem (20) für den mindestens einen Funkabdeckungsbereich unter im wesentlichen gleichen Zeitbedingungen eingesammelt wurde; und
    Mittel, die auf den Vergleich ansprechen, um Straßenverkehrsbedingungen in dem genannten mindestens einen Funkabdeckungsbereich abzuschätzen.
  12. System nach Anspruch 11, welches weiter folgendes enthält:
    ein Sprachinformationssystem (53) zur Übertragung zu mindestens einem Benutzer der genannten aktiven mobilen Endverbraucherapparate (90, 91) einer Nachricht, welche eine Engpaßbedingung in mindestens einem Abschnitt mindestens einer der Straßen angibt, wenn der gegenwärtige Strom für den genannten mindestens einen Funkabdeckungsbereich den vergangenen mittleren Strom für den genannten mindestens einen Funkabdeckungsbereich um einen gegebenen Prozentsatz übersteigt.
  13. System nach Anspruch 12, bei welchem der mindestens eine Abschnitt der genannten mindestens einen der Straßen mindestens einem Funkabdeckungsbereich zugeordnet ist, der durch einen Tabelle identifiziert ist, die in einem Speicherbereich (100) des genannten Prozessors (55) enthalten ist.
  14. System nach Anspruch 11, welches weiter folgendes enthält:
    ein Sprachinformationssystem (55), das eine Information entsprechend den genannten festgestellten Straßenverkehrsbedingungen an ausgewählte Benutzer der genannten aktiven mobilen Endverbraucherapparate (90, 91) überträgt.
  15. System nach Anspruch 11, welches weiter folgendes enthält:
    einen Speicherbereich (100), der eine Tabelle enthält, die den genannten mindestens einen Funkabdeckungsbereich bestimmten Abschnitten mindestens einer Verkehrsstraße zuordnet, wobei mindestens ein Abschnitt der mindestens einen Verkehrsstraße in dem genannten mindestens einem Funkabdeckungsbereich gelegen ist, so daß Straßenverkehrsbedingungen für die genannten bestimmten Abschnitte dieser mindestens einen Verkehrsstraße abgeschätzt werden können.
  16. System nach Anspruch 11, bei welchem die Funk-Verkehrsüberwachungseinrichtung eine Gesamt-Verfolgungszahl von aktiven mobilen Endverbraucherapparten (90, 91) in dem genannten mindestens einem Funkabdeckungsbereich verfolgt; und
    der Prozessor (55) eine erwartete mittlere Zahl von aktiven mobilen Endverbraucherapparaten in dem genannten mindestens einem Funkabdeckungsbereich mit der Gesamt-Verfolgungszahl in dem genannten mindestens einem Funkabdeckungsbereich vergleicht.
  17. System nach Anspruch 16, bei welchem die erwartete mittlere Zahl von aktiven mobilen Endverbraucherapparaten in dem genannten mindestens einem Funkabdeckungsbereich auf einer vorausgegangenen analogen äquivalenten Information beruht, die zuvor durch das Funk-Kommunikationssystem (20) eingesammelt worden ist.
  18. System nach Anspruch 11, bei welchem die genannte Funk-Verkehrsüberwachungseinrichtung eine Zeitdauer verfolgt, die von jedem der genannten aktiven mobilen Endverbraucherapparate in dem genannten mindestens einen Funkabdeckungsbereich verbracht wird; und
    der Prozessor (55) eine Gesamtzählung der genannten aktiven mobilen Endverbraucherapparate in dem mindestens einen Funkabdeckungsbereich bestimmt, welche eine längere Zeitdauer als die erwartete Zeitdauer in dem mindestens einen Funkabdeckungsbereich verbringen.
  19. System nach Anspruch 18, bei welchem die erwartete Zeitdauer auf einer vorausgegangenen analogen äquivalenten Information basiert, die zuvor durch das Funk-Kommunikationssystem (20) eingesammelt worden ist.
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DE69611274T3 (de) 2007-03-15
EP0763807A1 (de) 1997-03-19
DE69611274T2 (de) 2001-08-09
US5732383A (en) 1998-03-24
JPH09128679A (ja) 1997-05-16
DE69611274D1 (de) 2001-01-25
MX9603902A (es) 1997-07-31
CA2183284C (en) 1999-07-27
EP0763807B2 (de) 2006-08-16
CA2183284A1 (en) 1997-03-15

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